git stuff, mount/umount/eject all in C, .hal-mtab usage, light_sensor

and keyboard_backlight additions including example.

Remove ChangeLog and add rules to Makefile.am (from cairo) to generate
the ChangeLog file from git history.

Add support for light_sensor and keyboard_backlight on my Macbook
Pro. Add an examply python script to examples/ to show how it's done.

Move Unmount, Eject and related stuff to C. Start using the file
/media/.hal-mtab instead of .created-by-hal to specify if HAL created
the mount point. Also list tons of metadata such as uid, session id
(still unused). Fixes the bug where the unprivileged hald couldn't
look into /media/foobar/ for the .created-by-hal file. So now doing
'umount /dev/sda1' on a volume mounted by HAL, makes hald remove the
mount point as one would expect.

1 files changed, 88 insertions, 0 deletions

diff --git a/examples/light_sensors_and_keyboard_backlight.py b/examples/light_sensors_and_keyboard_backlight.py
new file mode 100755
index 00000000..1c402b4d
--- /dev/null
+++ b/examples/light_sensors_and_keyboard_backlight.py
@@ -0,0 +1,88 @@
+#!/usr/bin/python
+#
+# Simple program to set the keyboard backlight according to how much
+# light is around. This is a very rough example, real production code
+# needs to poll much less often and probably fade the backlight from
+# 3-4 predefined values instead of jumping around like crazy.
+#
+# Copyright (C) 2006 David Zeuthen <david@fubar.dk>.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#
+
+import dbus
+import sys
+import time
+import os
+
+bus = dbus.Bus(dbus.Bus.TYPE_SYSTEM)
+manager = dbus.Interface(bus.get_object('org.freedesktop.Hal', \
+                                        '/org/freedesktop/Hal/Manager'), \
+                         'org.freedesktop.Hal.Manager')
+light_sensor_udis = manager.FindDeviceByCapability('light_sensor')
+keyboard_backlight_udis = manager.FindDeviceByCapability('keyboard_backlight')
+
+if len(light_sensor_udis) < 1 or len(keyboard_backlight_udis) < 1:
+    print 'Light sensors:       ', light_sensor_udis
+    print 'Keyboard backlights: ', keyboard_backlight_udis
+    print ''
+    print 'This program needs at least one light_sensor and one keyboard_backlight.'
+    sys.exit(1)
+
+light_sensor_num_sensors = dbus.Interface(bus.get_object('org.freedesktop.Hal', \
+                                                         light_sensor_udis[0]), \
+                                          'org.freedesktop.Hal.Device').GetProperty('light_sensor.num_sensors')
+
+keyboard_backlight_num_levels = dbus.Interface(bus.get_object('org.freedesktop.Hal',       \
+                                                              keyboard_backlight_udis[0]), \
+                                             'org.freedesktop.Hal.Device').GetProperty('keyboard_backlight.num_levels')
+
+light_sensor = dbus.Interface(bus.get_object('org.freedesktop.Hal', \
+                                             light_sensor_udis[0]), \
+                              'org.freedesktop.Hal.Device.LightSensor')
+
+keyboard_backlight = dbus.Interface(bus.get_object('org.freedesktop.Hal',       \
+                                                   keyboard_backlight_udis[0]), \
+                                    'org.freedesktop.Hal.Device.KeyboardBacklight')
+
+
+clamp = 0.35
+
+last_val_set = -1;
+
+while 1:
+    try:
+        levels = light_sensor.GetBrightness()
+        sum = 0
+        for l in levels:
+            sum += l
+        val = float(sum / light_sensor_num_sensors) / keyboard_backlight_num_levels
+        if (val > clamp):
+            val_to_set = 0
+        else:
+            val_to_set = (clamp - val) / clamp * (keyboard_backlight_num_levels - 1)
+            if (val_to_set < 0):
+                val_to_set = 0
+            elif val_to_set >= keyboard_backlight_num_levels:
+                val_to_set = keyboard_backlight_num_levels - 1
+            
+        if val_to_set != last_val_set:
+            last_val_set = val_to_set
+            keyboard_backlight.SetBrightness(val_to_set)
+            print 'val_to_set is ', val_to_set
+
+        time.sleep(0.1)
+    except Exception, exception:
+        print exception